Improvement in bolts asd bolt-heads



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IMPROVEMENT IN BOLTS AND BOLT-HEADS.

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TO ALL W'HOM IT MAY CONCERN Be it known that I, JOSEPH CROMPTON, ofLittle Falls, in the county of Passaic, State of New Jersey, haveinvented a new and useful Improvement inf Bolts and Bolt-Heads, und thatthe following is a full and exact description thereof, which will enablethose skilled in thev art te make and use the same, reference being hadto the accompanying drawing, forming partot` this specification, inWhich- Figure 1 shows the bolt, with its appurtenances, applied tosecure n patclu marked B, upon the side oi' a boiler. 4 ix Figure 2 isan axial section of the bolt and its appurtenances, showing alsoasectidii of the boiler-plate und patch.

Figure 3 is an elevation, showing the bolt-head, the eccentric-collar,and the patch, the boiler-plato being supposed to he removed, but itsoutlines being represented in red. I

Y Figure 4 is a plan view of the small end of the bolt.

lhe object of this invention is to provide a bolt which will enable oneto attach and secure one plate or article to another in cases where theinner side of the latter is inaccessible, so that one cannet get in aposition to apply a'rivet. In order te illustrate my invention, I haveselected the example of a steamV boiler, to which, while it isinaccessible, or while hot, a. patch`J is te be applied to cover afracture, and'n'hich c-Jpatclf eonsequently must be applied fromwithout. i

The letter A designates a portion of thc side or plate of a steamboiler, and B is part of a patch, which isto be secured thereto. Holesare made through the boiler-plate at the several places where the boltswhich secure the patch are to be inserted, and holes of like size and atequal distances apart are made in the patehf' The drawing shows one suchhole through the boilerplate and patch. The letter C designates aboltused for uniting the patch to the boiler. The bolthas a screw-thread cuton its body te receive a nut, E. v It has an eccentric-head, F, whosediameter is about the same as that of the holes in the boiler and patch;or, its diameter may be a very little less, in order to allow the headto be put through them. When the head has been pushed through far enoughto clear the boiler-plate, the bolt is brought up against the edges ofthe holes, so as lte make the shoulder or eccentric-enlargement of thehead, clearly shown in the drawing, overlap the boiler-plate. In orderto retain the bolt-headin this position, an eccentric-collar, II, (oneside being thicker than the other,) is inserted at the same time withthe bolt, or else after it hasl been got in the holes, and before itisbrought up to its place. In this example the collar H does not form acomplete circle, but is crescent-shaped, as is seen in iig. 3. Thethickest part of the cellar is put opposite the ecccntrieity of the headF by turning the bolt after it and the collar are pushed in far enough,so as to cause its shoulder to overlap the edge of the hole in theboiler, the collar being made of such dimensions as to till the spacebetween the body of the belt and the sides of the holes. In order thatthe workina-n or operator may know the exact position of the head, andwhether its enlarged side is diametrically opposite the thicker part of'the collar, I make an indentation, G, er other mark on the end of the'bolt near the side on which the enlargement or eccentricity of the headF is located, by observing which indentation or mark, andcausing it tobe diametrically opposite the thickest part of the collar, one canina-ke sure that the bolt-head is in its proper place. The collar andboit together are oi' such size er dimensions as to lill the holes assnugly as possible', in order to proven/t leakage as much as possible.The collar can be matic of copper or iron, or other suitable niateriahCopperis suitable for the purpose, because it expands readily, andtherefore will aid in making a tight joint about the bolt. After thebelt and collar are in place, a washer, I), of copper, or other suitablematerial, is put on the bolt, and the nut E is then screwed tight, so asto draw the patch B and the holt-bead snugly against the oppositesurfaces of' the boiler-plate. Inorder to insure againstlcakagc the boltmay have a fillet of tow Yor other ibrous packing wound around itbetween the end of the eccentric-collar'and the bolt-head or, the collarmay be made shorter than the united thickness of the boiler-plate andthe patch; and the annular space thus left between the circumference ofthe bolt and the sides or edge of the hole in the patch may be occupiedby a ring et' copper or other soft metal, which can be jammed up by thetightening ofthe nut, and expanded so as to close the joint; or, boththeseuiodes of packing the joint may be adopted. The patch B is unitedto the boiler in this manner at as many places as is found necessary anddesirable. This mode of uniting two pieces of metal or othei` materialeen be applied and used in many other places and circumstances besidesthe one described in this example.

Hoving thus described my invention, what I claim, :mil lesite to secureby Letters Put-ent, isv 1. The eocentrically-headetl screw-bolt C, incombination with the nut E :md the eceentriocolhu H, plaeetl around thebolt, substantially as described.

2. I also claim the combination of the bolt C, having :m eccentric-heed,F, with the @comizio-collet H, o1"F its equivalent, the patch ox plateB, and the boiler-plate, or article to which the plate l? is united,substantially as shown.

JOSEPH CROMPTON.

Witnesses JOHN BERKEL- HENRY Surnom-x

